Metallic packing



(No Model.)

T. GRABTREE. METALLIC PACKING.

No. 545,580. Patented Sept. 3,1896.

m m I C m "m 6 3 MMW INVENTOH W/TN; SSE S: Z0 mm ATTORNEY,

UN TED STATES P TENT OFFICE.

THOMAS CRABTREE, OF MOCOOK, NEBRASKA.

METALLIC PACKING SPECIFICATION forming part of Letters Patent No.545,580, dated September 3, 1895.

Application filed November 15, 1894. Serial No. 528,946. (No model.)

To all whom it may concern:

Be it known that I, THOMAS CRABTREE, residing at McOook, in the countyof Red Willow and State of Nebraska, haveinvented certain -usefulImprovements in Metallic Packing; and I do hereby declare that thefollowing is a full, clear, and exact description of the invention, suchas will enable others skilled in the art' to which it appertains to makeand use the same, reference being had to the accompanying drawings,which form a part of this specification.

This invention has relation to a new and novel improvement in metallicpacking. This improved packing is more especially addapted to be used inconnection with pistonro s.

In the accompanying drawings, Figure 1 shows a central sectional View,with parts broken away, of my improved metallic packing as applied to apiston-rod, while Figs. 2, 3, and 4 show detached detail views of thesame.

A represents the broken front portion of an ordinary cylinder-headprovided with the usual opening to accommodate the pistonrod B. Securedto the piston-head, and preferably upon the outer forward edge, is apreferably rectangular metallic housing D. This housing is secured tothe cylinder-head A by means of bolts 2. This housing D is provided witha central opening through which the piston-rod B works. Surrounding thepiston-opening I prefer providing the cylinder-head A with a dishedopening of preferably two diameters, as is shown at 4 and 5 in Fig. 1.Within this opening I place an ordinary packing-ring a, which may be ofmetal or any other suitable material or composition. Within the hollowhousing D is contained my improved metallic packing, comprising threerings in section and held together by suitable springs. The first or.principal packing-ring comprises the dished ring 0, which is in twoparts, one of which is shown in Fig. 2. This ring has an annular groove3, to accommodate a suitable spring, and a central opening 6, throughwhich the piston-rod B is made to pass. Working within this sectionalring 0, which is preferably composed of two parts, is a two-partmetallic packing-ring E, which is preferably provided with a pin 7,working in a suitable opening within one of the half-sections C of thedished packing-ring. A spring 8 encompasses the also in two parts, andboth sectional rings E r and O are so made that when. they encompass thepiston-rod B there is considerable space between the ring-sections, asis shown in Fig. 4, so that as this packing wears itwill begraduallybound upon the piston and so take up this wear, preventing an opening.It will be noticed that a perfectly clear binding space or surface ispresented by means of this duplex packing-ring (l E, as the openingsbetween the ring-sections E E are closed by the solid portions of therings 0, while the outer openings of the packing-rings C are of courseclosed by the solid portions of the sectional rings E. The pin 7prevents these rings E from shifting, so that the two openings cannotcome opposite one another and so permit the escape of steam. To escapethe steam would have to pass along the piston and then between the faceof the two packing- I with a circumferential groove within which is helda spring 9, normally tending to close these two ring-sections. Thesesections are placed within the housing D, so that the removed portionslie ninety degrees from one another, so that a solid wearing surface ispresented by the combined rings F and H to the piston B, but whichwearing surface is, of course, permitted an adjustment, as it were, inthat as it is worn the spring closes these rings and so continues tobind them one upon the other. It is of course understood that theseinterior rings 0, F, and H are preferably made of Babbitt metal or someother anti-friction material such as is used in stulfing-boxes.

It will be noticed by the arrangement of the instrumentalities that Ihave provided a stufling-box encompassing a cylinder-rod, whichcylinder-rod is encompassed by four sectional rings. Each of thesesectional rings is of a diameter somewhat less than half a circle, andall four of these sectional rings are spring-actuated, so that a Wearingor face surface is presented to the piston-rod, which automaticallyadjusts itself to thediameter of the piston-rod. The instrumentalitiesare, further, exceedingly simple of construction, inexpensive, and canbe readily inserted or removed by simply unthreading the bolts 2 andthen removing the housing D, when any one or all of the metallicpacking-rings can be removed or placed upon the piston-rod.

Now, having thus described my said invention, what I claim as new, anddesire to secure by United States Letters Patent, is

section being less than half acircle and being provided with acircumferential groove, and the spring 9 within said groove, allsubstantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

THOMAS GRABTREE. Witnesses:

V J. P. LEE,

JAMES 1. LEE.

